st10f273m STMicroelectronics, st10f273m Datasheet - Page 18

• Manufacturer Part Number: st10f273m
• Description: 16-bit Mcu With 512 Kbyte Flash Memory And 36 Kbyte Ram
• Manufacturer: STMicroelectronics

Pin data
Table 1.
18/182
P0H.1 - P0H.7
P1H.0 - P1H.7
P0L.0 -P0L.7,
P1L.0 - P1L.7
EA / V
Symbol
P0H.0
STBY
Pin description (continued)
100-107,
111-117
118-125
128-135
108,
132
133
134
135
Pin
99
Type
I/O
I/O
I
I
I
I
I
External access enable pin.
A low level applied to this pin during and after Reset forces the ST10F273M to
start the program from the external memory space. A high level forces
ST10F273M to start in the internal memory space. This pin is also used (when
Standby mode is entered, that is ST10F273M under reset and main V
off) to bias the 32 kHz oscillator amplifier circuit and to provide a reference
voltage for the low-power embedded voltage regulator which generates the
internal 1.8V supply for the RTC module (when not disabled) and to retain data
inside the Standby portion of the XRAM (16 Kbyte).
It can range from 4.5 to 5.5V (6V for a reduced amount of time during the device
life, 4.0V when RTC and 32 kHz on-chip oscillator amplifier are turned off). In
running mode, this pin can be tied low during reset without affecting 32 kHz
oscillator, RTC and XRAM activities, since the presence of a stable V
guarantees the proper biasing of all those modules.
Two 8-bit bidirectional I/O ports P0L and P0H, bit-wise programmable for input or
output via direction bit. Programming an I/O pin as input forces the
corresponding output driver to high impedance state. The input threshold of
Port 0 is selectable (TTL or CMOS).
In case of an external bus configuration, PORT0 serves as the address (A) and
as the address / data (AD) bus in multiplexed bus modes and as the data (D) bus
in demultiplexed bus modes.
Demultiplexed bus modes
Multiplexed bus modes
Two 8-bit bidirectional I/O ports P1L and P1H, bit-wise programmable for input or
output via direction bit. Programming an I/O pin as input forces the
corresponding output driver to high impedance state. PORT1 is used as the 16-
bit address bus (A) in demultiplexed bus modes: if at least BUSCONx is
configured such the demultiplexed mode is selected, the pis of PORT1 are not
available for general purpose I/O function. The input threshold of Port 1 is
selectable (TTL or CMOS).
The pins of P1L also serve as the additional (up to 8) analog input channels for
the A/D converter, where P1L.x equals ANy (Analog input channel y, where y = x
+ 16). This additional function have higher priority on demultiplexed bus function.
The following PORT1 pins have alternate functions:
P1H.4 CC24IO
P1H.5 CC25IO
P1H.6 CC26IO
P1H.7 CC27IO
Data path width
P0L.0 – P0L.7:
P0H.0 – P0H.7:
Data path width
P0L.0 – P0L.7:
P0H.0 – P0H.7:
8-bit
D0 – D7
I/O
8-bit
AD0 – AD7
A
CAPCOM2: CC24 capture input
CAPCOM2: CC25 capture input
CAPCOM2: CC26 capture input
CAPCOM2: CC27 capture input
8 – A15
Function
D0 - D7
D8 - D15
AD0 - AD7
A
16-bit
16-bit
D8 - AD15
ST10F273M
DD
DD
turned